新型射流式喷灌自吸泵的水力设计与数值模拟

The Hydraulic Design and Numerical Simulation of the New Self-Suction Sprinkler Irrigation Jet Pump

通过分析自吸泵结构和自吸性能的不足,对自吸泵的压水室进行了改进,由正导叶式环形流道改进为正反导叶组合式流道,从而改变了流体的速度,流体顺着反导叶流到导叶中心,减少了流体对泵壳的冲击,并有效地减少或消除了泵腔的水流速度环量,使气水分离更加充分,达到了提高自吸性能的目的。采用加大流量设计法对新型节水农业用射流式喷灌自吸泵的叶轮和压水室进行了水力设计,并通过应用Pro/E和Fluent软件,对加设了反导叶结构的泵体进行了3D结构设计和数值模拟,验证了增设反导叶结构的意义。

Through discussing the disadvantage of self-suction capability and structure of self-suction sprinkler irrigation pump,introduce the new structure named double-guide blade which is combined with the positive and negative guide blades.It changes the velocity of the fluid which goes into the center of guide vane along the anti-guide vane.Thus,the impact of the fluid in the pump is reduced,and the water flow velocity circulation of pump cavity are reduced or eliminated effectively.The self-suction capability of the pump can be improved and the self-suction time is shortened.The hydraulic design of the impeller and volute are done by designing methods of oversize-flow.The 3D physical design and numerical simulation for the double-guide blade pump are done by the software of Pro-e and Fluent.As a result,the significance is verified by this paper.